If you've not tried Gameloft's Dungeon Hunter franchise, it's definitely worth taking a look at. Dungeon Hunter 2 was the first in the series to be released on Android (and is still only available for select devices on the Gameloft store), and is genuinely one of the most fun titles I've played on mobile. Dungeon Hunter 3, though it went to a free-to-play model, was still extremely entertaining and undeniably well-done (4.5 stars with over 100,000 reviews on the Play Store).